could fibrillate
Verbo regular: fibrillate - fibrillated- fibrillated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could fibrillate
you could fibrillate
he could fibrillate
we could fibrillate
you could fibrillate
they could fibrillate 	I could be fibrillating
you could be fibrillating
he could be fibrillating
we could be fibrillating
you could be fibrillating
they could be fibrillating	I could have fibrillated
you could have fibrillated
he could have fibrillated
we could have fibrillated
you could have fibrillated
they could have fibrillated	I could have been fibrillating
you could have been fibrillating
he could have been fibrillating
we could have been fibrillating
you could have been fibrillating
they could have been fibrillating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't fibrillate
you couldn't fibrillate
he couldn't fibrillate
we couldn't fibrillate
you couldn't fibrillate
they couldn't fibrillate 	I couldn't be fibrillating
you couldn't be fibrillating
he couldn't be fibrillating
we couldn't be fibrillating
you couldn't be fibrillating
they couldn't be fibrillating	I couldn't have fibrillated
you couldn't have fibrillated
he couldn't have fibrillated
we couldn't have fibrillated
you couldn't have fibrillated
they couldn't have fibrillated	I couldn't have been fibrillating
you couldn't have been fibrillating
he couldn't have been fibrillating
we couldn't have been fibrillating
you couldn't have been fibrillating
they couldn't have been fibrillating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I fibrillate?
could you fibrillate?
could he fibrillate?
could we fibrillate?
could you fibrillate?
could they fibrillate? 	could I be fibrillating?
could you be fibrillating?
could he be fibrillating?
could we be fibrillating?
could you be fibrillating?
could they be fibrillating? 	could I have fibrillated?
could you have fibrillated?
could he have fibrillated?
could we have fibrillated?
could you have fibrillated?
could they have fibrillated? 	could I have been fibrillating?
could you have been fibrillating?
could he have been fibrillating?
could we have been fibrillating?
could you have been fibrillating?
could they have been fibrillating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I fibrillate?
couldn't you fibrillate?
couldn't he fibrillate?
couldn't we fibrillate?
couldn't you fibrillate?
couldn't they fibrillate? 	couldn't I be fibrillating?
couldn't you be fibrillating?
couldn't he be fibrillating?
couldn't we be fibrillating?
couldn't you be fibrillating?
couldn't they be fibrillating? 	couldn't I have fibrillated?
couldn't you have fibrillated?
couldn't he have fibrillated?
couldn't we have fibrillated?
couldn't you have fibrillated?
couldn't they have fibrillated? 	couldn't I have been fibrillating?
couldn't you have been fibrillating?
couldn't he have been fibrillating?
couldn't we have been fibrillating?
couldn't you have been fibrillating?
couldn't they have been fibrillating?